When Yuuta finally discovered the murderer, he had already chosen his victim, mercilessly hunting her down in order to experience the surge of adrenaline one gets when ending a life. That's why Yuuta didn't waste any time sneaking right behind the murderer. He could hear him exhaling excitedly underneath his breath as if he was a dog in heat. It was obvious that he was solely focused on the woman he had cornered. Even though Yuuta had already reverted back to his human form, the murderer still didn't notice him. He closed in on the distance, still no response.
This time, the murderer had already pulled a cleaver from his inventory, swinging it back and forth, further tantalizing his victim. He also slowed down his pace in order to enjoy the terror seen on the woman's visage. He wasn't even hiding it, he was enjoying such a thing.
But Yuuta didn't allow him to do anything further than that.